no money from fnb but money taken sameday

Early afternoon on saturday 25.04.2015 went to withdraw at fnb atm with my international card at bothasig centre were i reside in i inserted my card asked for a pin then amount then i pressed the amount of 700rand that my mother had put and it said unable to i called my mother she sent me the slip that she did send the money but she will go to the bank on monday to check if its errore 4rm her side so i told her i will try smaller amount maybe its charges which i did.it stil gave me unable to with no slip.monday morning my mom called her bank in ireland bank statement shows there was 700rand withdrawn which i did not get anything accept unable to from fnb.i decided to go fnb branch in N1 city to get more information because i have been drawing from fnb with my international card.i went to the info desk spoke to zandile nana who told me they cant assist me because im not fnb client but strangely fnb is able to charge me with their charges but im not a client.she went to her superia which superia said to her that she must call 011 number which was never answered however zandile said sometimes fnb clients do come for this in their branch they cnt help me so how can i get my money?